Floatingly mounted multi-piece rolling tool, and rolling machine

Abstract

A rolling tool (5) has a basic body (6) for fastening the rolling tool (5) in a rolling machine (1) and a profiled part (7) for the shaping treatment of a workpiece (2) to be rolled. The basic body (6) and the profiled part (7) are of multi-piece design. The basic body (6) and the profiled part (7), in their interconnected position, are mounted movably relative to one another in a plane perpendicular to the rolling direction (23). The basic body (6) of the rolling tool (5) can also be part of the rolling machine (1).

Claims

1. A rolling machine (1) tool (5), comprising a basic body (6) for fastening a rolling tool (5) in the rolling machine (1), a profiled part (7) for the shaping treatment of a workpiece (2) to be rolled, wherein the basic body (6) and the profiled part (7) are a multi-piece structure and structured such that they can be connected to one another and nondestructively separated from one another, wherein the basic body (6) and the profiled part (7), in their interconnected position, are mounted movably relative to one another in a plane perpendicular to the rolling direction (23) while exclusively overcoming static friction between them, and wherein, in the operating position of the rolling tool (5) in the rolling machine (1), the basic body (6) and the profiled part (7) are structured such that they can be connected to one another by negative pressure, magnetism, and/or spring force.

2. The rolling machine (1) as claimed in claim 1, wherein the degree of the movability along only one axis in the plane perpendicular to the rolling direction (23) is between 0.1 mm and 0.3 mm.

3. The rolling machine (1) as claimed in claim 1, wherein the profiled part (7) is structured as a threaded rolled part with a pitch, and a degree of the movability along only one axis in the plane perpendicular to the rolling direction (23) is between 5% and 15% of the pitch.

4. The rolling machine (1) as claimed in claim 1, wherein the basic body (6) and the profiled part (7), in their interconnected position, are mounted movably relative to one another in the plane perpendicular to the rolling direction (23) along only one axis, namely a movement axis (Z).

5. The rolling machine (1) as claimed in claim 4, wherein the profiled part (7) has a length (L) and a width (B), wherein the rolling direction (23) extends parallel to the length (L) of the profiled part (7), and wherein the movement axis (Z) extends parallel to the width of the profiled part (7).

6. The rolling machine (1) as claimed in claim 4, wherein the movement axis (Z) corresponds to the longitudinal axis of a workpiece (2) to be rolled which is received in the rolling tool (5).

7. The rolling machine (1) as claimed in claim 1, wherein the basic body (6) and the profiled part (7) are movably connected to one another such that, after a relative movement, they are not urged back into a starting position by a resetting means.

8. The rolling machine (1) as claimed in claim 1, wherein the profiled part (7) has a smaller thickness than the basic body (6) and/or of 10 mm or less.

9. The rolling machine (1) as claimed in claim 1, wherein a maximum thickness of the profiled part (7) is between 4 mm and 10 mm.

10. The rolling machine (1) as claimed in claim 1, wherein the profiled part (7) is arranged on the basic body (6) as seen in the radial direction (8) of the workpiece (2) to be rolled, and/or wherein the profiled part (7) has a profile-imparting portion (9) for the shaping treatment of the workpiece (2) to be rolled and a connecting portion (11) for connection to the basic body (6), and/or wherein the basic body (6) has no profile-imparting portion for the shaping treatment of the workpiece (2) to be rolled, but a fastening portion (20) for fastening in a rolling machine (1) and a connecting portion (12) for connection to the profiled part (7), and/or wherein the rolling tool (5) is structured as a rolling jaw.

Description

BRIEF DESCRIPTION OF THE FIGURES

(1) The invention is further explained and described below on the basis of preferred exemplary embodiments that are represented in the figures.

(2) FIG. 1 shows a schematic side view of a part of a first exemplary embodiment of a new rolling machine having two rolling tools at the start of the shaping treatment of a workpiece to be rolled.

(3) FIG. 2 shows a partially sectioned schematic view of a further exemplary embodiment of the new rolling tool having negative pressure ducts.

(4) FIG. 3 shows a partially sectioned schematic view of a pair of a further exemplary embodiment of the new rolling tool having basic bodies, which are integrated into the rolling machine, with negative pressure ducts.

(5) FIG. 4 shows a partially sectioned schematic view of a further exemplary embodiment of the new rolling machine with a negative pressure connection.

(6) FIG. 5 shows a schematic view of a pair of a further exemplary embodiment of the new rolling tool having magnet holders.

(7) FIG. 6 shows a schematic view of a pair of a further exemplary embodiment of the new rolling tool having magnet holders and springs.

(8) FIG. 7 shows a schematic side view of a part of a further exemplary embodiment of the new rolling machine having two rolling tools with a tongue and groove connection at the start of the shaping treatment of a workpiece to be rolled.

(9) FIG. 8 shows a schematic view of a pair of rolling tools having a profiled part, which is movably mounted relative to its associated basic body, with a first tracking error.

(10) FIG. 9 shows a schematic view of the pair of rolling tools according to FIG. 8 with a second tracking error.

(11) FIG. 10 shows a schematic view of a pair of rolling tools according to FIG. 8 in the aligned position without tracking error.

(12) FIG. 11 shows a sectional view of a further exemplary embodiment of the new rolling tools.

(13) FIG. 12 shows one of the rolling tools from FIG. 11.

(14) FIG. 13 shows a side view of the rolling tool according to FIG. 10.

(15) FIG. 14 shows a schematic plan view of a further exemplary embodiment of the new rolling tools having a movement drive.

(16) FIG. 15 shows a schematic side view of one of the rolling tools according to FIG. 14.

(17) FIG. 16 shows a perspective view of an exemplary embodiment of the new rolling tools for explaining the geometric conditions.

DESCRIPTION OF THE FIGURES

(18) FIG. 1 shows a schematic side view of a first exemplary embodiment, which is represented only in parts, of a new rolling machine 1 for the shaping treatment of a workpiece 2 to be rolled. In the present example, the workpiece 2 is a screw 3. However, it could also be another workpiece 2 to be treated by rolling.

(19) The rolling machine 1 has two mounts 4 which each serve for the fastening of a rolling tool 5 of a pair of rolling tools 5. In the present example, the rolling tools 5 take the form of parallelepipedal or plate-shaped rolling jaws. However, they could also have a somewhat different geometry.

(20) Apart from the design of the rolling tools 5, the further details of this embodiment of the rolling machine 1 correspond to the prior art, and therefore a further description can be dispensed with.

(21) The respective rolling tool 5 has a basic body 6 for fastening the rolling tool 5 to the mount 4 of the rolling machine 1. The rolling tool 5 further has a profiled part for the shaping treatment of the workpiece 2 to be rolled. The basic body 6 and the profiled part 7 have been produced as separate elements—i.e. they are of multi-piece design—and have then been connected to one another to form the rolling tool 5. In this way, the basic body 6 and the profiled part 7 are designed such that they can be connected to one another and nondestructively separated from one another.

(22) The profiled part 7 is arranged on the basic body 6 as seen in the radial direction 8 of the workpiece 2 to be rolled.

(23) The profiled part 7 has a profile-imparting portion 9 for the shaping treatment of the workpiece 2 to be rolled. The profile-imparting portion 9 has a profiled external geometry with projecting regions and recessed regions which correspond to the desired external geometry to be rolled of the workpiece 2. In the present illustrated example, the profile-imparting portion 9 serves for rolling the thread 10 of the screw 3. However, it could also have a different geometry and serve for rolling another outer contour.

(24) The profiled part 7 further has a connecting portion 11 for connection to the basic body 6. The connecting portion 11 is arranged opposite to the profile-imparting portion 9 and extends substantially at a distance therefrom and parallel thereto. The basic body 6 has a corresponding connecting portion 12 for connection to the connecting portion 11 of the profiled part 7. Opposite to the connecting portion 12, the basic body 6 has a fastening portion 20 for fastening in the rolling machine 1.

(25) In the illustrated example, the two connecting portions 11, 12 and hence the profiled part 7 and the basic body 6 are connected to one another by a connecting technique (not shown). This takes the form of negative pressure, magnetism, form-fitting and/or spring force, as will be further explained below.

(26) In the illustrated example, the profiled part 7 has a smaller thickness than the basic body 6. It is less than half the thickness of the basic body 6.

(27) As is symbolically illustrated in FIG. 1 by way of the arrow 13, in this case the upper rolling tool 5 is positionally fixed and the lower rolling tool 5 is movably arranged and driven in the direction of the arrow 13. Here, the arrow 13 corresponds to the rolling direction 23 (more precisely to the rolling sense of direction). During the movement of the lower rolling tool 5 in the direction of the arrow 13, the blank of the workpiece 2 is received between the profile-imparting portions 9 and correspondingly formed. This type of forming is known per se in the prior art and is therefore not further described herein in the following.

(28) FIG. 2 shows a first concrete type of connection between the basic body 6 and the profiled part 7. In this case, the connection is realized by applying a negative pressure. For this purpose, the basic body 6 has one or more negative pressure ducts 17. The negative pressure ducts 17 are connected in terms of pressure to the connecting portion 11 of the profiled part 7, with the result that they exert the desired negative pressure action and the resultant connecting action on the profiled part 7.

(29) The external geometry of the profile-imparting portion 9 is clearly evident in FIG. 2. It is further evident that the connecting portions 11, 12 are each formed as planar surfaces.

(30) FIG. 3 illustrates a further embodiment of the rolling machine 1 in which the basic body 6 is part of the rolling machine 1. In this case, the connection between the connecting portions 11, 12 is again realized by means of negative pressure which prevails via the negative pressure ducts 17.

(31) FIG. 4 illustrates further details of the embodiment of the rolling machine 1 having a negative pressure connection 21 for realizing negative pressure connection.

(32) The rolling machine 1 has a negative pressure source 18 which is connected to the negative pressure connection 21 via a negative pressure line 19. The negative pressure connection 21 is connected to the negative pressure duct 17. Negative pressure is generated via the negative pressure source 18, the negative pressure line 19, the negative pressure connection 21 and the negative pressure duct 17 in such a way that the desired connection between the basic body 6 and the profiled part 7 of the rolling tool 5 is achieved.

(33) FIG. 5 illustrates a view of the rolling machine 1 according to FIG. 1 from the right such that the workpiece in the form of a screw 3 and the profile-imparting portions 9 are better visible. However, by comparison with FIG. 1, a connecting technique is illustrated here. Also shown is a position adopted later in time in the rolling operation in order to be able to show the formation of the thread 10 of the screw 3. The thread 10 has been illustrated in simplified form in that the pitch typical for a thread has not been taken into consideration in the drawing. However, it will be appreciated that what is concerned is a standard thread with a pitch. With regard to the corresponding aspects of the illustration of FIG. 2 and the following figures, reference is made to the above-indicated description of FIG. 1 for the purpose of avoiding repetitions.

(34) In the present example, each of the rolling tools 5 has a connecting means which is formed as a magnet holder 24. The magnet holder 24 has a plurality of magnets 25 which are arranged in corresponding cutouts in the basic body 6. The magnets 25 ensure the desired floating mounting between the basic body 6 and the associated profiled part 7. Here, the basic body 6 can be formed either as part of the rolling machine 1 in the sense of being integrated into the latter or as an add-on part to the rolling machine 1.

(35) FIG. 6 shows a further exemplary embodiment of the rolling tool 5 of the rolling machine 1. In this case, the connection between the basic body 6 and the profiled part 7 is again realized by the magnet holders 24.

(36) However, these are supplemented by springs 31 formed here as disk springs 32. They are fastened to the basic body 6, in particular by screw connections. However, they could also be other suitable springs 31. In this way, the desired play is realized such that the profiled part 7 can move relative to the basic body 6 in the plane perpendicular to the rolling direction 23.

(37) FIG. 7 shows a further exemplary embodiment of the rolling tool 5 of the rolling machine 1. In this case, the connection between the basic body 6 and the profiled part 7 is realized by two form-fitting connecting elements 29. What is concerned here is a tongue and groove connection 30 having an (exaggeratedly illustrated) play 33 between the groove and the tongue. There thus results a clearance fit such that the profiled part 7 can move relative to the basic body 6 in the plane perpendicular to the rolling direction 23 along the movement axis Z. Here, the profiled part 7 is held on the basic body 6 by means of the springs 31.

(38) FIGS. 8, 9 and 10 are schematic views showing different relative positions between the rolling tools 5 of a pair of rolling tools 5 in order to more precisely explain the self-adjustment achieved by the floating mounting. In the example illustrated, only the profiled part 7 illustrated on the right is floatingly mounted and thus carries out the alignment. However, it is also possible that both profiled parts 7 are floatingly mounted and jointly carry out the alignment. The force components resulting during the rolling operation are illustrated in the figures by arrows. With the profiled parts 7 correctly aligned with one another, only the horizontal force 26 occurs.

(39) It is evident in FIG. 8 that a deviation between the thread 10 and the profile-imparting portion 9 (see dashed line) of the profiled part 7 illustrated on the right is present. This deviation concerns the movement axis Z.

(40) Present in addition to the horizontal force 26 is the upwardly directed tracking error force 27, thereby producing the obliquely upwardly directed resulting force 28. If the rolling operation were continued with this relative alignment, the thread 10 of the screw 3 would be incorrectly formed.

(41) FIG. 9 illustrates the other kind of a tracking error. In this case, the tracking error force 27 is directed downwardly. The horizontal force 26 and this tracking error force 27 thus produce the obliquely downwardly directed resulting force 28. This alignment also gives rise to an incorrect formation of the thread 10.

(42) FIG. 10, however, now illustrates the position of the profiled parts 7 of the pair of rolling tools 5 that automatically results on account of the floating mounting of the profiled part 7 illustrated on the right. In the course of the rolling process, the profiled parts 7 of the pair of rolling tools 5 are automatically aligned with one another. This is possible on account of the translational degree of freedom, which is provided by the floating mounting, in the plane illustrated in FIG. 9 along the movement axis Z. This movement axis Z extends perpendicular to the rolling direction 23. There is thus no longer present any tracking error, and therefore the horizontal force 26 corresponds simultaneously to the resulting force 28 and the thread 10 is correctly formed.

(43) FIG. 11 illustrates a further exemplary embodiment of a pair of rolling tools 5. In this case, the rolling tools are not formed as parallelepipedal or plate-shaped rolling jaws but as cylindrical rollers. These rollers here again for example produce the thread 10 of the screw 3. For an illustration of the thread 10, reference is made to the above-indicated statements for FIG. 2. In this example, the connecting portions 11, 12 are cylindrical surfaces which are connected to one another in a suitable manner. The movable connection is not further illustrated in this drawing. However, reference is analogously made in this respect to the above-indicated statements.

(44) FIGS. 12 and 13 show one of the rolling tools 5 from FIG. 8 in two different views. Particularly evident here is the cylindrical design of the connecting portions 11 and 12.

(45) FIG. 14 shows a schematic plan view of a further exemplary embodiment of the rolling tools 5. In this case, they have a movement drive 34. The movement drive 34 has a motor 35, a motor controller 36, a movement sensor unit 37 and a coupling element 38. The movement drive 34 serves to support the relative movement between the profiled part 7 and the basic body 6 in a motorized manner. The coupling element 38 is operatively connected to the profiled part 7. The motor 35 drives the coupling element 38 rotationally or translationally back and forth. This movement is transmitted by the coupling element 38 to the profiled part 7 and thus brings about the desired translational movement of the profiled part 7 relative to the basic body 6.

(46) The movement drive 34 has a movement sensor unit 37. The movement sensor unit 37 detects a relative movement between the profiled part 7 and the basic body 6 that automatically results from the rolling operation and increases said relative movement. As soon as the tracking error force is no longer present or a limit value is undershot, the motor 35 is switched off. If the tracking error force changes its sense of direction, the rotation sense of direction of the motor 35 is reversed.

(47) FIG. 15 schematically shows the connection between the coupling element 38 and the profiled part 7 of the rolling tool 5 according to FIG. 14.

(48) FIG. 16 shows a perspective view of an exemplary embodiment of the new rolling tools 5 to explain the geometric conditions. Here, the left rolling tool 5 is movable and the right rolling tool 5 is fixed. It is clearly evident how the movement axis Z extends relative to the rolling tool 5 and the workpiece 2 in the form of a screw 3.

LIST OF REFERENCE SIGNS

(49) 1 Rolling machine

(50) 2 Workpiece

(51) 3 Screw

(52) 4 Mount

(53) 5 Rolling tool

(54) 6 Basic body

(55) 7 Profiled part

(56) 8 Radial direction

(57) 9 Profile-imparting portion

(58) 10 Thread

(59) 11 Connecting portion

(60) 12 Connecting portion

(61) 13 Arrow

(62) 17 Negative pressure duct

(63) 18 Negative pressure source

(64) 19 Negative pressure line

(65) 20 Fastening portion

(66) 21 Negative pressure connection

(67) 22 Connecting means

(68) 23 Rolling direction

(69) 24 Magnet holder

(70) 25 Magnet

(71) 26 Horizontal force

(72) 27 Tracking error force

(73) 28 Resulting force

(74) 29 Form-fitting connecting element

(75) 30 Tongue and groove connection

(76) 31 Spring

(77) 32 Disk spring

(78) 33 Play

(79) 34 Movement drive

(80) 35 Motor

(81) 36 Motor controller

(82) 37 Movement sensor unit

(83) 38 Coupling element